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bug#9181: 24.0.50; Alpha transparency no longer works

From: David De La Harpe Golden
Subject: bug#9181: 24.0.50; Alpha transparency no longer works
Date: Wed, 03 Aug 2011 16:12:03 +0100
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110626 Icedove/3.1.11

On 03/08/11 12:50, Jan Djärv wrote:

...I've yet to encounter any that propagate the property...

Metacity (gnome 2.x) and unity-decorator (Ubunty 11.04) does.

Shrug. Metacity 2.34.1 does not appear to do so on my system. Dunno about unity, not in a position to try it without excessive messing about. Setting opacity on the client window absolutely does _work_ (i.e. make the window translucent) under metacity with its compositing enabled, but it doesn't actually propagate the window property as such. i.e. If I disable metacity builtin compositing and use xcompmgr with metacity instead, it's not picked up, which I checked in case xprop and xwininfo -tree were lying to me (they apparently weren't).

Typical compsiting managers are separate programs from the window
manager (compiz for example), so they don't know what window is the
client window.

Except they aren't anymore, most compositing managers you encounter nowadays _are_ combined compositing/window managers e.g. kwin, xfwm4, metacity. Also compiz: nowadays typically run as a sort of combined (though multiprocess) compositing window manager with a "compiz window decorator" rather than a separate true traditional wm. The gtk+ one looks like metacity, uses metacity themes ...isn't metacity. And is apparently non-reparenting => no propagation involved anyway.

I do understand the motivation for the propagation hack, but it's just not what current versions of currently typical desktop env wms seem to be doing (AFAICT on my debian/unstable system). Again, either way, emacs blindly setting the property on its parent is the wrong thing. I just suspect filing bugs upstream to window managers for the non-propagation at this stage is something of a lost cause.

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